Die-rollina process and apparatus



M y 1930? w. H. DONNER DIE ROLLING PROCESS AND APPARATUS Filed April so. 1926 2 Sheets-Sheet l May 13, 1930.

w. H. DONNER DIE ROLLING PROCESS AND APPARATUS -'Filed A ril 50, 1926 2 Sheets-Sheet 2 Patented May 13, 1930 PATENT OFFICE WILLIAM H. DON'NER, OF BUFFALO, NEW YORK DIE-ROLLING PROCESS AND APPARATUS Application filed April 30,

This invention relates to a process of and apparatus for rolling blanks of irregular cross sections in series by means of successive sets of die rolls.

l Ieretofore die rolling of blanks of irregular cross sections in series has been carried on only by means of a single pair of die rolls and consequently the bar of metal had to be completely formed into blanks, ready for separating and trimming after a single action of the die rolls. The variation of the'cross section at different points on the blank had to be-confined within a restricted range, since there are, of course, practical limits to which metal can be shaped by a single action of a pair of die rolls. In forging with dies, by hammer or press, the metal is not only subjected to several actions witha single die, but frequently to the actions of other dies, and as each action of a die squeezes the metal. and reduces its thickness where applied, it will be readily'seen that-such blanks can be produced by a plurality of successive-sets of die rolls, with a greater differential in cross section and more complicated in design than it is possible to produce with a single pair of die rolls. I

It is obvious that in many designs the use of a plurality of sets of die rolls to act successively upon-the bar is advantageous, as,

for instance, where a greater reduction in cross section is required than can be pro- .duced with a single set of die rolls or where a more complicated pattern is involved. Two sets are also preferable in making some designs within the range of a single set because the reductions, being more gradual, are less severe, and because more perfectly formed blanks can be produced. Also'less metal is required as the fin can be reduced and in some instances eliminated. The work of finishing these blanks is also lessened and their cost correspondingly reduced. The piece of metal or series of blanks after leaving the final set of die rolls, can be cut into separate blanks, the fin, if any, sheared off in a trimming press and the blank finished for the purpose as designed.

The employment oftwo sets of die rolls offers dill' iculties. In ordinary rolling prac- 1926. Serial No. 105,724.

tice a bar is passed from one set of rolls into another, regardless of theposition of the peripheries of the rolls. Frequently only one roll in a pair is directly driven, the other being driven by friction, whereas in die rolling the peripheries of each pair must beaccurately mated in accordance with the design thereon and both rolls in a set must be positively driven at the same circumferential speed and the partlyformed bar in passing 0 from one set of die rolls into another, must properly enter the succeeding set so that the action of its rolls will harmonize with the work of thepreceding set.

Itwill be seen that if the bars have been timed to pass from one set of die rolls directly into another set rotating at a fixed speed relation, their proper entrance into the latterwould be possible to arran e provided the elongation of the bars was always the same,

but-any variation in the elongation of the bars occurring at the first set of die rolls would change their entrance into the suc- 1 ceeding set with respect'to the design on the peripheries of the rolls of such set, and if the action of such succeeding set is not'in agreement with the configurations on the bars, made by the preceding set,'failures and re-' sultant losses must occur.

It is not practicable to always control the elongation produ ced" by the first set of die rolls because any change in the draught of the rolls, the size of the bar or its temperature will affect the elongation. Therefore, if j the partly formed bars proceed directly from 5 one set of die rolls into another, the entrance of the pa-rtly'fo'rmed bars into the succeeding set of die rolls cannot be regulated so as to ensure proper registration and failures and ,losses due to such variation in elongation will result. If more than two sets of die rolls are employed, these difliculties would be compounded.

Furthermore, even if the partly formed bar properly enters the succeeding set, the 5 relative action of this set must be such that there will be no buckling or stretching of the bar between the two sets of rolls.-' The buckling of a small sizedbar could be taken care of by looping, but not so with a large sized out interruption from one set: of rolls into another and it is not uncommon for thebar I to be in two sets of rolls at the same time. Such a mill, however, is not practicable for most purposes in die rolling. If it were ossible to produce a series of forging blanks y passing a bar directly from one set of die rolls into another, the relative speed of both sets, the question of flash, quarter turning the bar, and the reduction in cross section of the bar effected by each'set would have to be so carefully taken into consideration to assure coordinate action of the two sets of rolls and to obviate buckling or stretching. the bar, that a special machine to produce each type of blank would be required which could not be readily changed for rolling other designs of blanks, and even then the partly formed bar would always be subject to the danger of variation in elongation and improper registration as heretofore explained.

The objects of this invention are to provide a die'rolling process and apparatus whereby various sizes and designs of blanks can be rolled by means of the same equipment, excepting, of course, the die rolls themselves; also to rovide a process and apparatus for die rolling by which a bar is acted upon by only one set of die rolls at a time, and after leaving a set of die rolls is delivered with precision into a succeeding set of die rolls in such a manner that the configurations on the partly formed bar register correctly with the depressions in said'rolls so as to form the series of blanks desired; also to provide a method and apparatus which is. efiicient, dependable, and accurate in harmonlzing or coorchnatmgthe action-of two successive sets of die rolls on a bar.

Other objects of this invention are to provide a method of and apparatus for die rolling in which a bar or work is so fed to the first set of die rolls that the configurations formed in each bar will be located 1n a definite or predetermined relation to the for- 1 ward end of the bar,which predetermined relation is utilized for correctly positioning the bar or work with reference to succeeding sets of die rolls; also to provide a process and apparatus in which a bar, after it has passed through a set of rolls, is brought to a stop afidthen fed to a succeeding set of rolls in such a manner that the configurations .on the bar will register correctly with the depressions invthe rolls; also to improve methods and apparatus of this kind in other respects hereinafter specified.

Inthe accompanying drawings, I

Fig. 1 is a top plan View showing more or less diagrammatically ad e rolhng mill on which my process may be carried out.

Fig. 2 is a top plan view on an enlarged.

Fig. 5 is a fragmentary side elevation thereof. partly in section.

In the embodiment of the invention shown in the drawings, two sets of die rolls are shown, together with the necessary mechanism for correctly feeding the bar to each set of rolls. It will be understood, however, that it is not intended to limit this invention to use in connection with two sets of die rolls only, since it is obvious that more successive sets of die rolls may be employed without departing from my invention.

In accordance with my improved method of die rolling, each bar of predetermined shape and area, is positioned and fed into operative relation to the first set of die rolls in such a manner that each bar is delivered to these rolls in definite and proper relation to the design on the peripheries of the rolls.

In the first set of die rolls the forming of the first blank is started in a definite or predetermined relation to the forward end of the bar, for example, the first blank may be started exactly at the forward end of the bar, or

at a definite distance rearwardly from the forward end'ofthe bar. The object of accurately regulating the delivery of the bars into the first set of die rolls isto establish a definite or predetermined relationship between the partly formed blanks and the forward,

blank is one inch, this same distance will be maintained on all bars passing to'the same die rolls. I thereafter use this established relationship between the partly formed blanks and the forward ends of the bars for regu lating, by means of another similar delivering or feeding mechanism, the introduction of the bars into the succeeding set or sets of die rolls, so that the configurations on the bar or work will register with the rolls in proper relation to their design.

For the purpose of carryingout my invention, in accordance with the particular met-hod illustrated, the bar or work is first brought to a stop at a definite distancefrom the first set of rolls, this being preferably done by I stop means arranged in the path of movepartly formed blank in the bar is formed in r ment of the bar to the rolls. After the bar has been sto ped at a definite distance from definite predetermined relation to the forward end of the bar, and all succeeding bars are fed to the same set of rolls in the same manner, so that the configurations on all bars rolled have the same positions in relation to the forward ends of the bars. After the bar is discharged from the first set of .rolls, the 0 eration is repeated at each succeeding set 0 rolls, the bar being first stopped at a definite distance from the rolls and then advanced to the rolls in exact synchronism with the rolls, so that the configurations on the bar formed by a previous set orsets of rolls register accurately with the pattern on the sucneeding set of die rolls. 7

The delivery of each bar into each of two or more successive sets of mated die rolls is mechanically controlled by a separate apparatus preceding each set of die rolls and timed therewith, which introduces successive bars into said sets at exactly the same points in the peripheries of each set and by properly adjusting the apparatus preceding the succeeding set of rolls the correct registration of the design in rolls with'the config urations formed by the previous set of die I rolls is insured.

It will be understood that where the process employs two sets of die rolls, the work of the first set only approaches the ultimate design of the blanks to be formed and the second set completes it. If more thantwo sets are used, the work of the second set is only supplementary to that of the first set and where more than two sets are used, each succeeding set must have a separate apparatus to precede it, the function of which will be the same as that of the apparatus preceding the second set.

i Referring to the mechanism" shown, by

means of which my process may be carried on, A and A represent, respectively, the upper and lower die rolls of the first set'and B, represents the second set of die rolls, only the upper roll of which is-shown in Fig. 1.

These rolls may have any suitable designs, patterns or groovesa formed on their peripheries, depending upon the nature of the work which is being rolled, set ofdie rolls A, A, being such as to approach somewhat the form ultimately desired. If only two sets of rolls are used, the action of the second set will produce the final shape desired. It will be-understood that,

hile the rolls A and B are shown in the drawings as of the same diameter, the diameters of each roll depend upon the number and length of blanks designed in each roll, as the blanks are elongated in-each reducthe action of the first tion. If more than two sets of rolls are used, the action of each succeeding set of rolls will approach more closely the ultimate shape desired and attained by the la t set.

Since the two sets of rolls (except for the designs on the peripheries thereof) and the apparatus for feeding the work to each set are alike, one description only will be given and the reference characters applied to both sets of rolls and apparatus. The die rolls manner on the usual frame or bearing housings C. The work or bar X while being fed to or discharged from a set of rolls is supported on the usual roller feed table D, which in the articular construction shown includes a seri s of rollers on which the work may rest or move lengthwise. D represents a series of driven rollers, driven by bevel gears ther forward movement thereby. This stop device may be of any suitable or desired construction, that shown in the accompanying drawings including a stop member or bar 10 secured at one end to a block or hinge member 11, which is hinged or pivoted to swing the bar 10 in a vertical plane extending transmay be mounted in any suitable or desired versely of the direction of movement of the bar or work X. The hinge member 11 is hinged or journalled on a member 12 which] is adjustably mounted ona base 13 in any suitable manner, for example the adjustable member 12 may be provided with slots 14 through which suitable bolts extend for holding the member 12 in any adjusted position relatively to the base 13. This adjustment permits the stop 10 to be positioned at different distances from the die rolls. The stop is so located that when in its'horizontal position, it is located directly across'the path of movement of the bar to the rolls, to stop the Y bar from further movement toward the rolls.

The stop 10 may be out of the path of movement of the bar X by moved into a position means of any suitable mechanism. 'In the I construction shown the bar 10 may be swung about its hinge by means of a link 16, one end of which is connected to an arm 17 of the hinge member 11to which the bar 10 is secured, and the other end of the link 16 being pivotally connected with a crank arm 18 secured on arotary shaft 19 suitably journalled on fixed parts of the rolling mill. One end of the shaft19 is provided with a handle or crank 20 by means of which the shaft 19 may be turned sufficiently to move the link 16 to swing the stop 10 into or out of its operativeposltion. Any other means for controlling the position of the stop bar 10 may be provided.

After the bar Xto be rolled has passed upon the feed table or carriage'D and has 4 engaged'the stop 10, so that further forward movement of the bar is stopped, the bar is suitably clamped on the feed table or carriage D, which, in the construction shown, includes side frame members 21 and 22 on which rollers 24 are suitably journalled,

I which rollers support the bar X. This roller bar shown for this purpose, a pair of clamping jaws 27 and 28 are providedwhich are normally( spaced apart and between which the may enter on its way to the stop 10. The jaws 27 and 28 are provided with oppositely inclined rear faces 29 and 30, which maintain contact through atleast a part of their lengths with corresponding oppositely inclined faces formed onthe'blocks 31 and 32.

The block 31is rigidly secured on the frame member 21 of the roller table or carriage D and the other block 32 is movable transversely of the carriage, so that when the jaws 27 and 28 are in their back positions shown in Fig. 2, the jaw assembly 28 and 32 may be moved toward the jaw parts 27 and 31 to clamp the work between the jaws. This transverse movement of the jaw 28 is preferably effected by means of an eccentric 33 journalled on the frame member 22 of the carriage and acting on the block 32, the eccentric being adapted to be turned by a hand lever 34.

- It will be obvious from the foregoing description that when'a bar is clamped between the jaws 27 and "28 and moving towards the die rolls at a slo er speed than the peripheral s eed of the di rolls, the die rolls will, after (te bar enters, grip the same and draw'thebar forward faster than the carriage travels,

causing the jaws 27 and 28 to slide forward, The inclined bearing faces 29 and 30 of the jaws will also cause these jaws to move apart during their forward movement by the bar,

' and thus release the bar and permit the same b to pass freely through the rolls. After the bar has passed out of the jaws, the jaws may be returnedto their original positions relatively to the blocks131 and 32 by any-suitable means, for example a cross link 35 may connect with with pins 36 in the jaws 27 and 28. The-pins 36 preferably engage in slots 37 in the link'35 to permit lateral movement or separation of the jaws relatively to the link. The link'may be actuated to move the jaws back lengthwise :to their original or gripping positions by means of arod or bar 38 pivotally connected to the cross link 35 and the rod or bar may be actuated by means of a lever 39 pivoted at one end of the frame 21 of the roller carriage and. at a distance from this end to the rod or bar 38, the free end 7 of the lever extending into a position to be readily actuated by an operative. Any other, means for returningthe jaws 27 and 28 to their gripping positions provided. 7

The movement of the eccentric lever 34 into its clamping position is preferably effected by hand, and the releasing of the lever may be efi'ected by-means of an adjustable striking block 40 arranged on any suitable base,

the striking block'being provided with slots 41 through which clamping bolts or screws 42 extend for securing the striking block 40 on the base in different positions relative to the length of the rolling mill. The ad'ustable' block 40 is so arranged that upon the orwarql movement of the carriage D, the arm 34 will come in contact with the adjustable block 40 iand cause the arm to be swung'to the right in Fig. 4, thus moving the movable jaw 32 away from the fixed jaw 31 to permit the bar or work X to pass through the die rolls. After the bar X has been clamped on the roller table as described, the stop bar 10 is moved bymeans of the hand lever 20'out of its stop- 1 ping position and mechanism is then actuated for feeding the bar to the adjacent set of die rolls,

The mechanism for accurately feeding the bar to the die rolls may be of any suitable or desired construction, that shown including a gear 45 rigidly mounted on the shaft of one of the die rolls, for example on the shaft of the lower roll. This gear meshes with another gear 46 which in the particular construction shown is of twice the periphery of the gear 45, so that one revolution of the gear 45 produces a half revolution of the gear 46. This gear 46 is mounted to rotate freely about the axis of a crank shaft 47 suitably journalled onthebase of the machine and havmay, of course, be r ing a crank portion 48 which connects with one end of a pitman or connecting link 50, i

the other end of which is pivoted at 51 to a part or bracket 52 secured to the roller table D. Consequently the rotation of the crank shaft 47 producesa reciprocatory movement of the roller table D lengthwise of its supporting base 26, toward and from the adjacent set of die rolls.

A driving connection between the driven gear 46 and the crank shaft 47 is established by means of a clutchof any suitable construction, WhlCll is so designed that movement of the roller carrier or table D toward-the die rolls is effected during a definite p'ortioni of the revolution of the gear 46, and consequently during a predetermined part of the rotation of the die rolls, a clutch of the kind commonly used in connection with punch presses being preferably employed. In the particular construction illustrated. this clutch consists of a member 54 rigidly secured on the gear 46 and rotating therewith, and a complementary clutch member 55 splined on the shaft 47. The clutch member 55 includes a sleeve 56 having an annular groove therein, in which groove the forked end of a clutch shifting lever 57 engages. This lever is pivoted at 58 and is provided at the end thereof opposite to the forked end with a handle 60. When this handle 60 is swung in a direction to cause the clutch member 55 to move toward the clutch member 54, .a driving connection will be established between the gear 46 and the crank shaft 47 as soon as the gear 46 reaches its predetermined position, which driving connection starts the rotation of the crank shaft 47 only at a predetermined portion of the movement of the gear 46. The relationship between the die rolls, the stop bar 10, the gears 45 and 46 and the clutch members 54 and 55 is such that the forward movement of the roller carriage D will feed the bar X into correct relation to the pattern or design on the periphery of the rolls. The clutch is so constructed, as'is common with punch press clutches, thatthe two parts or members of the clutch are disengaged upon the completion of one revolution of the gear 46, such disengagement mechanism not being shown. Consequently after the clutch members have been placed into engagement the rotation of the gear 46 will turn the crank I shaft 47 to move the roller carriage D toward the rolls to feed the barinto the rolls. After the bar has been gripped between the rolls, it is released from the gripping jaws'27 and 28 as described. A further separation of the jaws is effected when the clamping lever 34 engages the striking block 40 which swings this lever into a direction to move the movable j aw 28 of the gripping device away from the other jaw 27. After the roller table has completed its path of movement toward the rolls, it is returned to its initial position shown inFigs. 4 and 5 and the stop bar 10 is then swung into its operative position.- The device is then ready to receive another bar. When the bar passes on to the table or carriage it comes to rest at stop 10, after which lever 39 is thrown into position as shown from -Fig. 3 to the position as shown in Fig. 2, and brings the blocks 27 and 28 in contact with the bar, after which lever 34 is pulled which tightly grips the bar and secures it to the carriage, and the operation of the apparatus is then repeated as described. It will be notedthat this method permits the utilization of long bars which can be rolled more economically than short ones and use 5 where the bar must be turned about its axis through a quarter of a revolution in entering the succeeding set of rolls, and is only in one set of rolls at a time, there is no torsion, the elimination of which is of considerable advantage in :rolling bars of large diameter, and the maximum power required at' anyone time is less than where the bar is in two sets of rolls at the same time.

' I claim as my invention 1. The process of die rolling a series of connected forging blanks which consists of passing a bar of metal at a forging tempera ture through a set of die rolls to form a series of blanks approaching in form the blank ultimately desired, then stopping the movement of said bar after the same has been discharged from said die rolls, and passing the bar into correct registration with depressions in a succeeding set of die rolls in which the partly formed blanks are further acted upon to form the same into the shape desired.

2. The process of die rolling a series of connected forging blanks which consists of passing a bar of metal at approximately forging temperature successively through different sets of die rolls, stopping the move ment of the bar after the same is discharged from a set of rolls, and positively feeding said bar to a succeeding set of die rolls by movement of its support in synchronism with the rotation of said succeeding set of die rolls so that the configurations on the bar will register correctly with depressions in the succeeding set of die rolls.

p 3. The process of die rolling a series of connected forging blanks which consists of passing a bar of metal at approximately forging temperature successively through a plurality of sets of die rolls, feeding the'bar to the first set of die rolls so that a constant and predetermined relationship is established between the forward end of the bar and the configurations produced on said bar by said die rolls, mounting the baron a support in predetermined position thereon, and shifting said support in synchronism with a succeeding set of die rolls in a manner to present the partially formed bar to the said succeeding set of die rolls in accordance-with L said relationship and in synchronism with the rotation of said succeeding set of die rolls.

. 4. The process of die rolling a series of con- 5. The pro'cesss ofdie rolling a series of connected forging blanks consisting of feeding set of die rolls to register with configurations on said barsj 6. The process of die rolling a series of connected forging blanks which consists of passing a bar of metal at a forging temperature into proximity to a set of die rolls, stoppingthe movement of the bar ata definite distance from said set of die rolls, delivering the bar to the die rolls so that the front end of the bar engages with a predetermined portion of said die rolls, advancing the bar in proximity to a succeeding set of die rolls, and feeding the bar into said succeeding set in definite relation thereto whereby the configurations on the bar register with the design on said die rolls.

7. The process of die rolling a series of connected forging blanks which consists of passing a'bar of metal at approximatelyforging temperature successively through a plurality of sets of die rolls, stopping the-bar with its front end located at adefinitedistance from each set of die rolls, gripping the bar while the same is stopped ata definite distance from the rolls, and advancing the'bar from such position into the die'rolls in .synchronism with the rotation of said die rolls so as to enter the bar in definite relation to the rolls, and releasing the grip on said bar after the Same enters said rolls.

8. The process of die rolling a series of connected forging blanks which consists of passing a bar of metal at a forging tempera ture through a set of die rolls in a definite relationto the pattern thereof to form a series of blanks approaching in form the blank ultimately desired, then stopping the movement of said bar after the same has been discharged from said die rolls at a predetermined distance from a. succeeding set of die rolls, and positively feeding said bar toward said succeeding set of die rolls when the rolls of said succeeding set are in a predetermined position in their rotary movement, to' cause the configurations of said bar toregister with the depressions in said succeeding set of die rolls.- 1

.9. The process of die rolling a series of conf'nected forging blanks by passing a bar of metal at approximately-forging heat successively through different sets of die rolls, and feeding said bar, after the bar has been discharged from a set of dierolls, to a suc same'rolling relation to the pattern thereof that the bar occupied with the pattern of the preceding rolls. 4

1,0. The process of die rolling fore-ing blanks by passing a bar of metal at a org ing heat through a set of die rolls having a peripherally continuous rollin pattern to form a series of connected blan s approaching in form the blank ultimately desired, then, after said bar has been discharged from said. die rolls, delivering said bar independent] y of other sets of rolls into correct registration with a succeeding set of die rolls also having a peripherally continuous rolling pattern, further rolling said partly formed blanks in said succeeding set of die rolls to further shape the blanks in accordance with the ultimate shape desired.

11. The process of rolling a seriesof connectedforging blanks by passing a bar of metal at approximately forging he successively through a plurality of sets of die rolls, accuratelyregulating the entrance ofrolls, so that the configurations on each bar will. register in pressions in said rolls.

12. A rolling mill for die rolling forging blanks which includes a plurality of sets of die rolls arranged so that the work must pass completely out of one set of die rolls before passing to the next set of rolls, means for stopping the work at each set of die rolls with its front end in proximity to the die rolls, a gripping device which grips the work'when the same is stopped, and driving connections between said die rolls and said grippi means for advancing the gripping means to position the front end of the work in definite relationto the design on said die rolls.

13. In a rollingmill for die rolling-forging blanks, the combination of a plurality of sets of die rolls arranged so that the work must pass completely out of one set of die rolls before passing to the next set of die rolls, normally stationary means for gripping the Work when the same is positioned at a definite proper relation to the de- 14. In a rollingmill for die rolling forging blanks, the combination era plurality of sets of die rolls arranged so that the work will be in only one set of die rolls at a time, feed tables adjacent each roll and movable toward a roll to feed work to a roll, means for feeding the work to said feed tables, and means for advancing each of said feed tables toward a set of die rolls in synchronism with the rotationof the rolls so that configurations on the work will register properly with depressions in the rolls. j w

' 15. In a rolling mill for die rolling-forging blanks, the combination of a plurality of sets of die rolls arranged so that work will be in only one set of die rolls at a time, feed tables adjacent each roll upon which thebars to be rolled are fed, and which feed tables are movable toward the adjacent sets of rolls to feed the bars to the rolls,mea ns for correctly positioning the bars on .the feed tables with reference to the rolls, and means for advancing the feed tables in synchronism with the ro'ltation of the rolls to feed the bars to the ro s. i

16. In a die rolling mill, the combination of a plurality of. sets of die rolls spaced apart so that thework will be in only one set. of die rolls at a time, stop means for stopping each bar at arpred etermined distance from a set of 'rolls, feed tables on whichthe bars rest while stopped, and means for advancing the feed tables toward the rolls in synchronism with the rotation of the rolls to feed the bars to the rolls.

- 17. In a die rolling mill, the combination of a plurality of sets of die rolls arranged so that the work will be in only one set of die rolls at a time, means for feeding the bars to the rolls, stops for interrupting the movement of the bars to the rolls, and means for advancing the bars, after they have been stopped to the rolls in synchronism with the rotation of the rolls.

- 18. In a die rolling mill, the combination of a pluralityof sets of die rolls arranged so that the work will be in only one set of die rolls at a time, means for stopping thebars at predetermined distances from the rolls, clamping devices for engaging the bars while stopped, means for moving said clamping connected blanks, which conslsts in trans- ,devices toward the rolls to feed the bars to the rolls, and means for releasing the clamping devices when the barsare gripped by the rolls.

' 19. In a die. rolling mill, the conil'iination of a plurality of sets of die rolls arranged so that the'work will be in only one set of die rolls at a time, gripping devices for engaging said bars, means for advancing said gripping devices toward the rolls vto feed the bars to the rolls, said gripping devices in-.

cluding j aws, which are movable by said bar when said bar is] advanced by said rolls, to

- causesaid movable jaws tov release the bars,

2t). a die rolling mill, the con'ibination of a plurality of setsof die rolls arranged so that the work will be in only one set of die rolls at a time, meansfor stopping said bars at predetermined distances from each set of rolls, and means for advancing the bars after the same have been stopped, to the rolls, said means including a crank adapted'to be rotated from said rolls and a clutch for coupling said crank with one of said rolls at a certain point-in the rotation of said rolls to cause said bars tobe fed to said rolls in synchronism with the rotation of the rolls.

21. In a (lie rolling mill, the combination of a pluralityof sets of die rolls arranged so that the work will be in only oneset of die rolls at a time, means for stopping said bars vat predetermined distances from each set of rolls at a time, stops arranged in the path of movement of the bars to said rolls, means for adjusting said stops relatively to said-rolls to cause saidcbars to be stopped at-the desired distances from said rolls, feed tables upon which said bars rest when stopped, means on said feed tables for engaging said bars while-stopped, mechanism for advancing said feed tables toward said rolls to feed said bars to said rolls. drive" connections between said feed table advancing mechanism and an adjacent set of rolls, a clutch in said drive connections which begins the operation of said drive connections during a predetermined point of the revolution of the rolls of the set to which the bar is to be fed, to cause the configuration on the bar to register'correctly with depressions in the rolls, and means for releasing said gripping meanswhen the, bars are advanced by said rolls,

28. The process of die rolling a series of ferring a bar of metal of uniform cross .sectlon at approximately forglng temperature until it reaches a predetermined position on ing table as the bar enters the rolls, thereby establishing a relationship between the forward end of the bar and the configurations thereon produced by the die rolls, transferring the deformed bar after it passes through the die rolls onto another delivering table in a predetermined position thereon, positioning the deformed bar on this delivering table and attachingit thereto, starting forward the table with the attached bar in the same relation to the pattern of the second set of rolls that it occupied with respect to the pattern in the preceding rolls, and automat-ically releasing the bar after it enters the rolls, whereby the bar will be properly acted upon and formed into the shape desired.

Zak-The process of die rolling a series of connected blanks, which consists in transferring a bar of metal of uniform cross section at approximately forging temperature until it reaches a predetermined position on a delivering table, having a positive forward movement timed with the rotation of the die rolls to which it delivers the bar, positioning and attaching the bar to the table, starting forward the table with the attached bar and delivering'it'into a set of die rolls, automatically releasing the bar from the delivering table as the bar enters the rolls, thereby establishing a relationship between the forward end of the bar and the configurations thereon produced by the die rolls, transferring the deformed bar after it passes through the die rolls onto another delivering table in a predetermined position thereon, turningthe deformed bar on this delivering table and attaching it thereto, starting forward the table with the attached bar in the same relation to the pattern of the second set of rolls that it occupied with respect to the pattern inthe preceding rolls and automatically releasing the bar after it enters the rolls, whereby the bar will be properly acted upon and formed into the shape desired.

25. The recess of die rolling a series of connected orging blanks which consists of passing a bar of'metal at a forging temperature into proximity to aset of die rolls, stopping the movement of the bar at a' definite distance from said set of die rolls, delivering the bar to the the rolls so that the front end of the bar engages with a predetermined por; tion of said die rolls, advancing the bar in proximity to a succeeding set of die rolls, placing the bar in the same position from said succeeding set of die rolls that it occupied before the preceding set of die rolls, and then feeding the bar into engagement with said succeeding set of die rolls in synchronized relation to the pattern of those rolls, whereby the configurations of the bar will properly register with the configurations of the pattern on the said second set of die rolls while passing therethrough.

WILLIAM H DONNER. 

